x=[1.00*2^1,1.25*2^1,1.5*2,1.75*2,-1.00*2,-1.25*2,-1.5*2,-1.75*2,0,1.00,1.25,1.5,1.75,-1.00,-1.25,-1.5,-1.25,1.00*2^(-1),1.25*2^(-1),1.5*2^(-1),1.75*2^(-1),-1.00*2^(-1),-1.25*2^(-1),-1.5*2^(-1),-1.75*2^(-1),0.25*2^(-1),0.50*2^(-1),0.75*2^(-1),-0.25*2^(-1),-0.50*2^(-1),-0.75*2^(-1)];
f = linspace(0,0,31);
scatter(x,f);